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  • 1975-1979  (4)
  • 1979  (4)
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  • 1975-1979  (4)
Year
  • 1
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    An upper limit for the total energy of relativistic particles contained in the early stages of supernova explosions (1979)
    Institute of Physics
    Details
    Publication Date: 1979-06-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    An upper limit for the total energy of relativistic particles contained in the early stages of supernova explosions (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A model is proposed for the emission of X-rays from supernova explosions wherein the thermal distribution of photons from a supernova photosphere is inverse Compton scattered by relativistic electrons within or near the surface of the star. Using this model, upper limits for the number of relativistic electrons and their total energy are established on the basis of upper limits to the observed X-ray luminosity of a supernova during maximum light. These upper limits, in conjunction with radio frequency upper limits obtained by Brown and Marscher, strongly suggest that supernovae do not produce significant numbers of relativistic particles until at least 70 years after the initial outburst. This, in turn, implies that young supernovae cannot account for the radio and X-ray variability of active galactic nuclei and quasars.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 230
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    On the Physical Environment in the Galactic Nuclei (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Galactic nuclei and quasars emit radiation over the entire electromagnetic spectrum. This suggests that concurrent observations over a wide frequency range may provide useful information in determining appropriate models for the physical environment in which the radiation is produced. In conjunction with observations by the high energy spectrometer on OSO-8, four sources have been studied in this manner; the nucleus of the elliptical galaxy, Centaurus A (NGG 5128); the quasar, 30273; the Seyfert galaxy, NGC 4151 and the nucleus of the Milky Way (GCX). Concurrent observations are used to construct the composite spectra (from radio to X-ray) for Cen A and NGC 4151 while the composite spectra of 30273 and GCX are derived from the OSO-8 data and from other observers. A skymap technique used to analyze observations of the galactic center region yielded data consistent with a significant, hard X-ray source at the radio and infrared position of the nucleus of the Milky Way. A theoretical analysis of the temporal variability of the Cen A data is undertaken and its implications discussed. Similarities between the composite spectra of the observed sources suggest that radio-bright and radio-quiet quasars may represent the emission from galactic nuclei with elliptical and Seyfert-like morphologies, respectively.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-80569
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Detection of high energy X-rays from the galactic center region (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Observations of the galactic center region made with the high energy X-ray detector on OSO-8 are discussed. A strong hard X-ray which was detected during these observations from the vicinity of the galactic center are examined. The counting rate spectrum and the photon number spectrum of the flux are determined. Comparisons with the high energy X-ray fluxes observed from sources in the region by others are discussed.
    Keywords: SPACE RADIATION
    Type: NASA-TM-80584
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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